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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad371cdb1ec025d6fefea6ebc81936109946393291e29d7cb1ec4a6d294d0168' 
  AND token = 'GXu0M3LaR5L1yKivhTuLXMP6X11cc0owJoTXhNXJI6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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