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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b33b33ba7afdae785166fbec224a3d5587e265dcde81a7da9c52a93f58f90c' 
  AND token = 'QRdUghHa69opMmJFa8n1NDzUJspJSsgw33IIqcySD+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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