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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0cbe1637408bbb9e3a78708dec4138611fb04e078869f304d62210bfdc9385' 
  AND token = 'AvIEusO1xoIbyoC5BATCo70ROW3/AfHGu5axvwY34sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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