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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767c20a9190577217c5702cc82ac5980914168848caf9a19f3dc109f947580b2' 
  AND token = '/MC7sa9nG3SlFC2wJXxIENx+62qAhlUlQsBN6ZN11fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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