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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168836c927bbe8a56390c92981824e5ca7c83e198194a9ff3e0370ba71c44988' 
  AND token = 'H1PCCQIvWmvpYnhZgI2Tylru+1Wu6s2OiAq9Pgp9NFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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