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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092efc3fcf5feba855ca3dca09248400ae56a77ad8934919cab3e9da0298afaf' 
  AND token = 'GArI5ZWrxHVqwbPQ8tfzdojopcgw1DBzpSso/N8P8oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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