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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff2fccfa00315db02e697ff77aec26454716a0c64e3a129a3e4c9123e4e6139' 
  AND token = 'JBAALlerCtYXBYvhdgx1peTdEfxhbSTRKo3Cng7ZNx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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