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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73d8b6c26fa4253e42d598c7528b26f1081899156731a56e76b5425ffe7b30b' 
  AND token = 'ZlspWEsvR8kNsI2Ll2OzucgkMfUSz7SqnLkXDcBoQW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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