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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85216727165c4549b8993260797bb0320ecc7aaefa7c24b6f1c307253bbc2c7e' 
  AND token = 'sSSor6BpOUSVBMVIRH8rK5oHVri/8YWsgZ8JRXqQDx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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