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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff8b9b25f6f7a0f70387344a0db3388f50f8ebaf1ee938f0ad4aed1fb76e16b' 
  AND token = 'MpP89mSyL5GqZ4shGEV3eYlUhNTv7jNr60UWfx3ilOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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