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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0edd8547e46ebb751d0e1a68b41a1c68a70aa92979a321af4d74b9a4b6daca' 
  AND token = 'YGjGsiTL2Shr+lqrxuBUQvK+qC84HLaGkEbGTsdLDys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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