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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f402eb67a75c3f8cd81aa3ca4aca34b1a3e25c59c9afeeb8c19e0a2d2ef478a' 
  AND token = 'QFQnITC9Vn0sxuQdd/uqLMJbGNwyftzgFe2yjb3G+n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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