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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469446e6f3ce663f4d72a37886d32ab5b5a42cb9ac96edbf288533f94871b444' 
  AND token = 'ZqCiTQewUx9YJ3wEZXedXLXDfcb5t2AuzWgBfUj8fZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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