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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853955325753b3d35f5544ed23c2008384bbc4baf9c201c268f6f039b309e29d' 
  AND token = 'GgKeWWAD5YMURGyR2AFMQIBWCw76//Wxa2e042JZH0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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