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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd831231908efcafa389f9bbd976a8dde2fd320332bc6ac5b42d8e220fcb20b' 
  AND token = 'PzZ476VdMkJAdEyCT2T6nWSPoA/PYc5SbeTveecDFzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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