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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd78206af2ed339b862e1a41f8733363a175337051b723c05b50c5569f986294' 
  AND token = 'SARVgDtPna9mdI39D16p8Z7rEZ3Z222ApMwQa0KNnto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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