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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb52946d5de52d1254b5b85734de02479ac9c3c06d1c06a449d4fbbb004cbf6' 
  AND token = 'rui0A8JWqKDXbt3FCW9Z2j2CjGZogx4PVo9M1PB64ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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