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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c821f1b3f8ced7befac2a724cb96b60a1e631c0d054e8782b2ca034a80161f89' 
  AND token = 'mRTd3NgGZDGAY/AX08H7MPDFCoNbU/4xiY2911uaXWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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