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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3837706d08d69874f7c82c6acb1cdd25ef8919ea18f87b07f1ba541357d084dc' 
  AND token = 'IQSc0S24YjZMIQuQkZTIFvyx8ToH8TKbvMdcATI2PE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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