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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9325867d85f1b40a7000f826da814e754ff75b81c8853fe340051367ae9848' 
  AND token = 'iPNsnx8MjJjopIBpdQMX6EISQNoUsKuy6R5DLdT6BIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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