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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9c4db61d6ec1f726534a16f598d3a94b80126f555b40b962a84c4e55a53c0b' 
  AND token = 'pCzIGoQLVkjciU6R10sEFH16OTcIt4OnIVJCoNhvZH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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