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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a3dcca2dae8138ad2ecf987739725918d195a7e81fe6b5a44fae7b7294c71f' 
  AND token = 'Yqm/tpYB9lZpAa04IC4rU3lXIswokniItgE2Mdtqq3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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