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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30027c99e7ccc0ce7a26528665aed4278ba74d6fefcef0d7b773929e3aa2ccb' 
  AND token = 'A+YNNX1efY+NgqfDd4sje9jR1tTDuB7BHocrVHno9kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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