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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1b7f8cd7f4376068f97dd37799778220eec27ff1aa35fb53d2bcc7d99bbdf0' 
  AND token = 'IINIme+6lKs4aprzz8fDZgpvEkTvhlVontXyiX6KzrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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