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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbbc2b4e5c218efac427288f5a028744d60201a5c421639347140c28c321a3c' 
  AND token = 'nv6HzoeKssBzMZX0bF2vlIvqKkp75ss30i/AivlQQ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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