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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990a4b95bfc88bc57c8114e7d72c28317d4eb5e216319efb2e157475c0bb2b16' 
  AND token = 'IDGUsxKQ1ZTFwkiz4BWBfxiBG+4ZWwX3nqUdN5ZB3JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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