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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf5701584b1d33a76b4b737a76e1bf87da48222879077a549dbf27828e371da' 
  AND token = 'bJFT43G3OHYGKWK4iklb5Bg4RtydkelZjZ0m+EPZgRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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