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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d368a07bbe4556dda641a11a404f8d35a9a9d7cb963d8370f7ba99884ff6a4' 
  AND token = 'IncYqXZ49PnVG8BbCFMc0+tsNLbdD0Uf76+jjyJ3Mls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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