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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c092509d5aa45714f073716c639fcfa7678fcec8d666bf611e333bbf636d05' 
  AND token = 'Cxb4TmH/VqxOC/cYZ0bh65UumqftWZA1Kck0BMpYHag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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