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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef84d34ac82808eca03128729dfff679a2f8d6db0dc330be377b51a28192568' 
  AND token = 'PwdNQv9cDV+alubjWsrA/p6l4M86/3vyTjJHcYKrHyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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