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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e18a829e795cfd6353f5fd651790d9f8d85bef56f93607eb9e18515d1f12d50' 
  AND token = '/M13w3VUZrl5V7su85md7QGPg8TjsZrWB2RT7KWBqrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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