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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a966b4f5ae3e956fe407d3fb4c5e7b9f76a81cb53c678a5fe7f0950548662d15' 
  AND token = '9IA2dcdK9PiaF0KNhZtmhmeXfljh0a8WikJ4jNQVCRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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