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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ccedeafe976fe60aaaf3a3e4c3aa7c49de0e109771ca244b9b0027bc26e328' 
  AND token = 'grZnCPy9SSBrSzzV62GUBLYbKihgmPshdS3UHFN9VDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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