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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9170f56a5847c0422c791e6327bd317e5b266e91117350bbb7ad1b7ad11a9b84' 
  AND token = 'Gv6dWFbZWmlj/OxVDpJmLfktB5wlZ0BlLs5HWsmoFAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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