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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df69b90955ab3adb3bc4ac4fee6f1807d8122bbfb491a3f8ee48821768fef09' 
  AND token = 'LOhCQAUqlJfkXlhpDZS3Aekkt/xLGALi85Odgb4O6l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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