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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6913ef875382ac638dad00d766ad13828e36d1ff7b59515d2b3d6578f135e942' 
  AND token = 'eGOE+KDxUcroivoq9Jni/+svoZOXuyog8cGHPI8y+30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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