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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda733d6a0c0820d361a68d76f9d76634a4fc6d8aa99b031e847319727ed8d5d' 
  AND token = 'm3K3NraDc4JEQP/1dF2kICrWGDZcoh7R59aGNYV+EcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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