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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7f22823a8b8e65f5e2fec8183b96badc6868902972ae1d9669a475802a8c06' 
  AND token = 'H9Bq3wcCUJOWygxAvnZ8F0oMXA7gMvBbEKbQLpDhEk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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