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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523d6358d5592f980c1de5622d661bab4b71eace9ab18403a6f996f4b041d324' 
  AND token = 'N/hpWXfc6MLClw22iqdpJwoM0nibsgItjy8Md0dBHkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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