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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6872de4f893d0b99920d6473784b2de94663e65970ad0bc358262dcd1ca9840' 
  AND token = 'oGGyfcswuBpUaLagabOV0IkU0bqSmCbdNG/bKFwwgIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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