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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033be9c5feb64f56eac9ae5e1e15e89c9a5a8f276a4024d59d1c84b250fe6080' 
  AND token = 'qrhXd+mTSQ9lrfBgq1H16W1bnBIc9oxBPSzTMy4ekVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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