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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad029099bb61d663308ca4abe9689375ceef526266adef1d435c7c95a1ea20c6' 
  AND token = 'qaaib7EdwHFf9UIvCANtDm/pnor4pY21o+Le+/jfzyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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