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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77083a6c7d2e6da8b8b5fd4c63da0717bc7274eb92310043bc683ac9d1f52b34' 
  AND token = 'Ja2nmfn8gXUfNPW9U1hm+xAktLg2Q3WSyYVkJELgAeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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