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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a534f592722702a4c796af693fb4bb742ceb3fcf299765abd863aede3af02409' 
  AND token = 'IKpnvyhwJUrDryEP4A9wh/TrJA8nLgKN72Ja2/wWQec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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