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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3987beed225bcf6ce07ba32ab3fa497e55a1b70c442c29a42874d7a074add53' 
  AND token = '34FQ3iuSZ2Q8K/Nb/DqxsE/IQSTEscaPxG3104qDduU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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