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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97546612f65914723bcf66b1c2a63b9f03fc219572045e0cb62a184fb5802de' 
  AND token = 'D4RN2ZKMd6AWLUKQr7ZVnllAYmHCau12fNoS1dm5uDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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