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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d8c0291e2f325bcd7df6b704c41f1bbd3978c77a0338268c18eb018b61764b' 
  AND token = 'P7jPE7S9z9bZ6ZzIrlkH2RL0CPu7yKjRE6+VS0M5aAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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