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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4990da8d212370bdc585ade322bc9a8c7e8d454b612250b327eeaa0381fa8be' 
  AND token = 'o2TvIt/mz950t3zo9zkus89AoicdWZOw2Q9b2Znn1Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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