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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164d2be39ce80bc01649aff2c9ab6cd7e70cfa2121dfd164ae04cdfe3bea004f' 
  AND token = '1rPzeFWck77DKOjKr4geI3ZUZj5jZF/E/Rnxz8YZ8rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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