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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5153ea296d3ac8524eb395b19f37b998f9e8ed8f3fbb95116cef1ff157354e' 
  AND token = 'nE7rQVPOnJdZFvCin4kwKSfmPEWRkZm22CbVF9w6rPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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