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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f182fdab8979bcf7ee69dbf47560c95b52ea8f6d9a24085356cc88005fa57d3' 
  AND token = 'u4iG/ORtEUfVAe7Iabm39nPktr1RKmsYoFdTXCUSj2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}