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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf30cd7689393bcb390050ccd635fc8e466f385aa05a6e2d6dbc1b6ccebf1bd0' 
  AND token = 'Bq61XKG7DT7buV0teA5SGyMenlWCWjwZUlsdfNMzqBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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