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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44b1efd5051b23605bf45c256df5962584345071cad19e7356e261cbc2a5a29' 
  AND token = 'GSPOzVKmvMGNDMh3DJQrf4AyMNN1f7CkYRKRJW7IcoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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