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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc19312b7930880bf9f0bff37c2a7694d6da5b7cae1d99a169083a3606b00f4' 
  AND token = '2YXOROHins/rs+NSdnPeSKKURNUwWYhJQT7YK8IEX9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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