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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd7257e4f3548c7922fe89a45877379500cce3dcfb622930c8200fb48309190' 
  AND token = 'MhSrabx7FQSNYw0Yq6OAnTDbScs2NoV14uiZHbHE2Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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