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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bd9616e9e61b54c8dd3533657b5d2fade548aa1b6b70a512bd325c6d547da9' 
  AND token = 'd7lpvffg1v/IQXu5KKD9IhbZ7TbbW+XFyogxxGOYHkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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