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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedd035eb4aeb6bc15dc6830103aa31ca55e282c9e813e70e969dd44a798db25' 
  AND token = 'WIx4wpGnfX3zclNH8JKZpVjdxAOdNw6nLSmqpExsoMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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