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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777628f35f7ebe4614da427e860182815ffb784600cdca02ce5fb24aaabd7f72' 
  AND token = 'SBef2sdwLMUVKG50bzyIOdALvBtTrZZ4u6jHpe6wQTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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