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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4bbaa564f74a64ddb6be72c240a192d8139995b3e61b99474dd519494f0439' 
  AND token = 'ug557K1FIccl429qb7XJ1IVVpMlvUoFA2OOKAryv2yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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