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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25645bd466bd8f9a982732a8ab2ad051a13b2ee134619c8bbe4260876fa5a52d' 
  AND token = '5Qs5Qlu91I0C+ozldj9Rh5MAe5C1FxhReOmrAz1tR78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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