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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00402c1bdaf04a6bc4a2af4f4545ab2b75625229511821b1737fe0b2c9e6beb3' 
  AND token = 'wVyB7bDEB9B/uq1FPqAqMqfHG9NyUqaqzXgWLqnk4m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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