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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7d03fc0e1d5bd9c338351ba5ac7934ef09f9d1f31034c1084d97df40537408' 
  AND token = 'WEer+2ZbnHv07v2iXd3rcBjfBltw63WKchVzDTo3e/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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