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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7daff4532d434e65b54727a8f1aa083138b36ff3cd40b9f303b9683ac087514' 
  AND token = 'W3/Xapo9QscfCte00ogSouAMnpQQYqSX8ZRlfi3AC1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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